3) E-Type formations start later - but I haven't found out when yet. I'll have to go back and look at videos

4) Spy Ships don't appear in the first two sectors until after the third formation attack

5) After that, it seems Spy Ships don't appear near the start of a sector - it's either after a formation attack (or two), or if you survive for a certain length of time (I have to fly the full height of the sector at least once)

6) Spy Ship appearances seem to (usually) follow formation attacks

7) When a formation attack is launching, it doesn't appear that any other ships will attack you (except Spy Ships) - again, I'll have to look at the videos

8 ) If you fly around long enough - a Red Alert will start, even without a Spy Ship. I don't know how long, however.

9) Alert! Alert! Seems to sound when a new threat is sighted - whether a ship or a space station. But it doesn't repeat for each one.

10) The arcade game is hard! I used to be a lot better at it. I think.